<template>
    <div class="star" :class="'star-'+size">
        <span class="star-item" v-for="(sc,index) in starClasses" :class="sc" :key="index"></span>
    </div>
</template>
<script>
//类名常量
const CLASS_ON = "on"
const CLASS_HALF = "HALF"
const CLASS_OFF = "off"
export default {
    props:{
        score:Number,
        size:Number,
    },
    computed:{
        //算法 3.2 3 + 0 + 2；3.5 3 + 1 + 1
        starClasses(){
            const {score} = this
            const scs = []
            const scoreInteger = Math.floor(score)
            for(let i=0;i<scoreInteger; i++){
                scs.push(CLASS_ON)
            }
            //向scs中添加n个on
            //向scs中添加0/1个half
            if((score - scoreInteger)*10 >= 5){
                scs.push(CLASS_HALF)
            }
            //向scs中添加n个off
            while(scs.length<5){
                scs.push(CLASS_OFF)
            }
            return scs
        }
    }
}
</script>
<style lang="stylus" rel="stylesheet/stylus">
     @import "../../common/stylus/mixins.styl"
  .star //2x图 3x图
    float left
    font-size 0
    .star-item
      display inline-block
      background-repeat no-repeat
    &.star-48
      .star-item
        width 20px
        height 20px
        margin-right 22px
        background-size 20px 20px
        &:last-child
          margin-right: 0
        &.on
          bg-image('./images/star48_on')
        &.half
          bg-image('./images/star48_half')
        &.off
          bg-image('./images/star48_off')
    &.star-36
      .star-item
        width 15px
        height 15px
        margin-right 6px
        background-size 15px 15px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star36_on')
        &.half
          bg-image('./images/star36_half')
        &.off
          bg-image('./images/star36_off')
    &.star-24
      .star-item
        width 10px
        height 10px
        margin-right 3px
        background-size 10px 10px
        &:last-child
          margin-right 0
        &.on
          bg-image('./images/star24_on')
        &.half
          bg-image('./images/star24_half')
        &.off
          bg-image('./images/star24_off')
</style>